CLAUSILIA. 281 



with a lens, or of a few striae near the mouth. It in- 

 habits the North of France, as well as every other part 

 of the Continent, and may be expected also to be found 

 in Great Britain. 



2. C. ROLPH'II*, Gray. 



C. Rolphii, Gray in Turt. Man. L. & F.W. Sh. p. 71, f. 54. C. plica- 

 tula, F. & H. iv. p. 120, pi. cxxix. f. 3. 



BODY dark-brown or dusky, with a reddish hue above, 

 greyish-brown on the sides and underneath; tubercles 

 blackish, arranged in very close lines : mantle thick, 

 yellowish-white, with small specks of pure white : tentacles 

 greyish-brown; upper pair rather short and stout, nearly 

 cylindrical as far as the bulbs, slightly shagreened and 

 covered with black dots, which are so minute as scarcely to 

 be visible with a lens of ordinary power, the bulbs thick and 

 nearly spherical ; lower pair exceedingly short and of a 

 paler hue than the others : foot very long, narrower in front, 

 ending in a slightly rounded tail : sole greyish-white. 



SHELL fusiform, rather thinner than the last species but 

 scarcely semitransparent, slightly glossy, reddish- or yellow- 

 ish-brown, with occasionally a few white lines dispersed 

 here and there over the surface, marked with strong, sharp 

 and somewhat regular transverse striae, of which there are 

 from sixty to seventy on the body of the last whorl ; these 

 striae are curved on the upper and somewhat flexuous on 

 the lower part of the shell, becoming fewer and consequently 

 more remote but stronger towards the outer lip; spiral 

 striae very indistinct and scarcely perceptible : periphery 

 angular : epidermis rather thick : whorls 9-10, tumid, but 

 somewhat compressed, the last being rather less than one- 

 third of the shell and a little narrower than the two pre- 

 ceding whorls ; the two or three first whorls are nearly of 

 the same breadth and form a short cylinder : spire abruptly 

 tapering and obtuse at the point : suture rather oblique, not 

 very deep : mouth subquadrangular, sinuous on the outer 

 side and effuse below; teeth as in C. rugosa, but in the 

 present species there are often two or three small teeth or 

 ridges between the columellar folds, and the lower of these 



* Named after Mr. Rolph, an English conchologist. 



